CHAPTER VII

CHANGES OF CLIMATE WHICH HAVE INFLUENCED THE DISPERSAL OF ORGANISMS: THE GLACIAL EPOCH

Proofs of the Recent Occurrence of a Glacial Epoch--Moraines--Travelled Blocks--Glacial Deposits of Scotland: the "Till"--Inferences from the Glacial Phenomena of Scotland--Glacial Phenomena of North America--Effects of the Glacial Epoch on Animal Life--Warm and Cold Periods--Palaeontological Evidence of Alternate Cold and Warm Periods--Evidence of Interglacial Warm Periods on the Continent and in North America--Migrations and Extinctions of Organisms Caused by the Glacial Epoch

_Pages_ 106-124